package com.xsqf.jt808.common.util;

import com.xsqf.jt808.entity.VehicleAuthInfo;

import java.lang.reflect.Field;
import java.lang.reflect.Method;

/**
 * BeanUtil
 *
 * @author
 * @date 2020/5/20 15:41
 */
public class BeanUtil {

    public static void main(String[] args) {
        VehicleAuthInfo authInfo = new VehicleAuthInfo();
        authInfo.setLicensePlate("  ll  88 ");
        authInfo.setTerminalId("  1 1 1 1");
        System.out.println(authInfo);
        try {
            VehicleAuthInfo o = (VehicleAuthInfo) BeanUtil.beanAttributeValueTrim(authInfo);
            System.out.println(o);
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    /**
     * 去掉bean中所有属性为字符串的前后空格
     *
     * @param bean
     * @throws Exception
     */
    public static Object beanAttributeValueTrim(Object bean) throws Exception {
        if (bean != null) {
            //获取所有的字段包括public,private,protected,private
            Field[] fields = bean.getClass().getDeclaredFields();
            for (int i = 0; i < fields.length; i++) {
                Field f = fields[i];
                if (f.getType().getName().equals("java.lang.String")) {
                    String key = f.getName();
                    //获取字段名
                    Object value = getFieldValue(bean, key);

                    if (value == null) {

                        continue;
                    }

                    setFieldValue(bean, key, value.toString().replace("\u0000", ""));
                }
            }
        }
        return bean;
    }


    /**
     * 利用反射通过get方法获取bean中字段fieldName的值
     *
     * @param bean
     * @param fieldName
     * @return
     * @throws Exception
     */
    private static Object getFieldValue(Object bean, String fieldName)
            throws Exception {
        StringBuffer result = new StringBuffer();
        String methodName = result.append("get")
                .append(fieldName.substring(0, 1).toUpperCase())
                .append(fieldName.substring(1)).toString();

        Object rObject = null;
        Method method = null;

        @SuppressWarnings("rawtypes")
        Class[] classArr = new Class[0];
        method = bean.getClass().getMethod(methodName, classArr);
        rObject = method.invoke(bean, new Object[0]);

        return rObject;
    }

    /**
     * 利用发射调用bean.set方法将value设置到字段
     *
     * @param bean
     * @param fieldName
     * @param value
     * @throws Exception
     */
    private static void setFieldValue(Object bean, String fieldName, Object value)
            throws Exception {
        StringBuffer result = new StringBuffer();
        String methodName = result.append("set")
                .append(fieldName.substring(0, 1).toUpperCase())
                .append(fieldName.substring(1)).toString();

        //利用反射调用bean.set方法将value设置到字段
        Class[] classArr = new Class[1];
        classArr[0] = "java.lang.String".getClass();
        Method method = bean.getClass().getMethod(methodName, classArr);
        method.invoke(bean, value);
    }
}
